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Transcutaneous Electrical Nerve Stimulator - T.E.N.S.
A TENS Units is a small electrical device that delivers electrical impulses across the skin. Transcutaneous (through the skin) electrical nerve stimulation sends an electrical current to specific nerves. The current may be delivered intermittently. The mild electrical current blocks pain ...

Transcutaneous Electrical Nerve Stimulator - T.E.N.S.
A TENS Units is a small electrical device that delivers electrical impulses across the skin. Transcutaneous (through the skin) electrical nerve stimulation sends an electrical current to specific nerves. The current may be delivered intermittently. The mild electrical current blocks pain signals to the brain and generates heat that serves to relieve stiffness, improve mobility, and relieve pain. The treatment is believed to stimulate the body's production of endorphins or natural pain killers.
Federal Law (USA) restricts this device to sale by or on the order of a physician. Doctor's Rx is required for purchase of TENS units.